Multi-decadal mass loss estimates are available for few glaciers of Central Asia. On Abramov Glacier (Pamir-Alay, Kyrgyzstan), comprehensive long-term glaciological measurements have been carried out from 1968 to 1999 and re-initiated in 2011. A climatological interpretation of this benchmark glacier in Central Asia requires bridging the gap between historical and renewed measurements. This is achieved here by computing the geodetic mass balance from 1975 to 2015 using previously unreleased Soviet aerial imagery and Pléaides stereo-imagery. During 1975–2015, Abramov Glacier lost 2.2 km2 (8.2%) of its area. The mean annual thickness change was − 0.43 ± 0.14 m a−1 for the period 1975–2015, corresponding to a volume change of − 0.45 ± 0.15 km3. The average specific geodetic mass balance amounts to − 0.38 ± 0.12 m w.e. a−1. The 1975–2015 glacier mass loss lies within the range of glaciological and geodetic mass-balance estimates that were previously published for disparate and shorter time intervals since 1968. This study covers a much longer time period than earlier geodetic estimates and demonstrates the capacity to geodetically constrain glacier change at high spatial resolution in Central Asia using historic aerial imagery and Structure from Motion techniques. Therefore, it could serve as a benchmark for future studies of regional mass change.

中文翻译：

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1975年至2015年阿布拉莫夫冰川的大地质量平衡

对于中亚的少数冰川，可以获得多年代际质量损失估计值。在阿布拉莫夫冰川（吉尔吉斯斯坦帕米尔阿莱），从 1968 年到 1999 年进行了全面的长期冰川学测量，并于 2011 年重新启动。对中亚基准冰川的气候学解释需要弥合历史和更新之间的差距测量。这是通过使用以前未发布的苏联航空影像和 Pléaides 立体影像计算 1975 年至 2015 年的大地质量平衡来实现的。1975-2015 年间，阿布拉莫夫冰川损失了 2.2 公里2(8.2%) 的面积。年平均厚度变化为 - 0.43 ± 0.14嘛-11975-2015 年期间，对应的体积变化为 − 0.45 ± 0.15公里3. 平均比大地质量平衡为 − 0.38 ± 0.12兆瓦.e.一种-1. 1975-2015 年冰川质量损失位于冰川学和大地测量质量平衡估计的范围内，这些估计自 1968 年以来以不同和更短的时间间隔发布。本研究涵盖的时间段比早期的大地测量估计要长得多，并证明了大地测量的能力使用历史航空影像和来自运动的结构技术以高空间分辨率限制中亚的冰川变化。因此，它可以作为未来研究区域质量变化的基准。